The cost of 5 boxes of envelopes and 5 boxes of note paper is $25.95. two boxes of envelopes and 6 boxes of note paper cost $22.
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The cross product of two vectors gives a third vector 
that is orthogonal to the first two.
Normalize this vector by dividing it by its norm:
To get another vector orthogonal to the first two, you can just change the sign and use
.
Normalize this vector by dividing it by its norm:
To get another vector orthogonal to the first two, you can just change the sign and use
